How to make my brother (Zac) laugh

1. Get him and pin him on the ground (may take 2 min max). 
2. Roll him over so he is on his belly (be careful he doesn't escape).
3. This is the hard part, securely push his arms down with your feet and make sure you are staring at his legs.
4. Last of all, get your hands and tickle him under the knees for as long as you like!
   Enjoy!
   
    How to make my dad (Martin) laugh

This is a hard one, I don't hear my dad laugh much so I can only give you suggestions. Not saying that he doesn't laugh, once he laughed so much because he found my lost sweater sitting in the cloak bay (it was as clear as day).
1. Maybe you could tickle him on the sides somewhere.
2. Also if this doesn't work, maybe show him something funny on YouTube or TV.
3. This is another one, I might ruin your life but give it a try. If you are really desperate get your brother to take an embarrassing pic of you and show it to him.
4. Our last hope is America's funniest home videos.
Try them out and hope it works. Fingers crossed.

 How to make my mum (Sarah) laugh
My mum laughs, but there is not really a specific way to do it. So I am not going to give you tips to do this.

 How to make me (Ben) laugh
I know how to make myself laugh, but this is classified info that will not be shared any time soon.

 So this is my family of laughs!

 Ben